A new H I catalog of Low Surface Brightness galaxies out to z = 0.1. Tripling the number of massive LSB galaxies known

Using both the Arecibo 305 m and the Nançay decimetric 100-m class radio telescopes, we have observed the H I line of 116 Low Surface Brightness (LSB) galaxies from the Bothun et al. (1985) subset of LSB galaxies in the Uppsala General Catalog. The observations had a detection rate of 70%, resulting in the new determination of H I properties for 81 galaxies. Surprisingly, roughly half of the detected objects (38) have M_HI ≥10¹⁰ M_⊙, placing them into the category of massive LSB galaxies. As previously only ∼18 of these ``Malin 1 cousins'' were known, our results have more than tripled the number of these fascinating and enigmatic systems known. Combining our results with previous studies done on the Bothun et al. catalog results in a well-defined catalog of H I properties of 526 LSB galaxies ranging in redshift space from 0 ≤z ≤0.1. With this catalog in hand, we have been able to explore the parameter space occupied by LSB galaxies more completely than has been previously possible. In agreement with previous studies, our results show LSB galaxies with some of the most extreme properties of disk galaxies, including M_HI/L_B ratios often exceeding 10 M_⊙/L_⊙,B.

Tables 1-3 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/428/823

Appendix is only available in electronic form at http://www.edpsciences.org